In the sentence, " sweep the sidewalk after mowing," how is the word, mowing, a gerund used as the object of preposition ?
also, how is the same word a noun (because it is a gerund)?

What is the primary purpose of this blog? to inform people about the new sports park to entertain people with details about the warbler to persuade people to protect the warbler to convince people to support the city council

Sister carrie, chapter ii theodore dreiser how does the author prepare readers for the last full paragraph of this passage? a) the author introduces carrie by showing readers the similarities between carrie and her sister, who is married to a hardworking man. b) the author introduces carrie as the jealous sibling of minnie, who works hard to make carrie feel welcome without upsetting her own marital balance. c) the author introduces carrie as an observant and young woman who notices the routine of her sister and brother-in-law, with whom she is staying. d) the author introduces carrie as a rather selfish and naive young woman who accepts the hospitality of her sister and brother-in-law until she can find a job in the city.

•your english teacher has asked you to write a short three-page research paper. which topic is the most narrow? a. water pollution b. how lake pollution affects fish c. how water pollution affects seal d. pollution